Oxy-acetylene burner



Feb. 28, 1933. WLLER 1,899,626

OXY-ACETYLENE BURNER Filed June 17, 1931 ,8. 211'. Miller Patented Feb.28, 1933 PATENT OFFICE BRYAN M. MILLER, OF WASHINGTON, DISTRICT OFCOLUMBIA OXY-AGETYLENE BURNER Application filed June 17,

This invention relates to oxyacetylene torches or burners and has for anobject to provide a burner which may be used for long periods of time toremove paint, rust, etc.,

from large structures, such as bridges, railway coaches and cars, etc.,without back fir- 1n The usual type of oxy-acetylene burner used incutting bars, rails and the like is capa- 0 ble of use only forshortperiods and then must be laid aside to cool. This renders such a burneruseless for continuous use for many hours, since it is well-known thatthe heat of the flame creeps back alon the jet block, causing a cherryred glow to he visible, which eventually reaches the manifold or chamberintegral with the back of the jet block and ignites the mixture, causingback firing, after which the burner must be allowed to cool beforefurther use.

I have discovered that if the jet block is formed of one block of metal,which constitutes one wall of the manifold, and if the remaining wallsof the manifold are formed 2 of a separate plate or plates of metal,welded or otherwise secured to the jet block, the union between the twodiiferent metals will be sufficiently imperfect to retard, if not inmost instances actually prevent, the conduction of heat back through thejet block to the manifold, so that back firing'is positively eliminated,and thus the tool may be used continuously for hours on a largestructure, while, at the same time, the welding of the metals togetheris suflicient to unite and bond the metals together so that leakage willnot occur. 7

One embodiment of carrying the above outlined principle into effect isillustrated in the accompanying drawing and described in the followingspecification, it being understood that various modifications may beresorted to within the scope of the appended claims without departingfrom the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a perspective view of an oxy- 1931. Serial No. 545,123.

acetylene burner constructed in accordance with my invention,

Fig. 2 is an enlarged cross sectional view taken on the line 2-2 of Fig.1,

Fig. 3 is an enlarged longitudinal sectional view taken on the line 33of Fig. 2,

Fig. 4 is a fragmentary perspective detail View showing the jet blockand the separate plates which coact with the jet block in forming themanifold, and v Fig. 5 is a fragmentary sectional view showing amodified form of the invention, in which a single plate coacts with thejet block in forming the manifold.

Referring now to the drawing in which like characters of referencedesignate similar parts in the various views, 10 designates the usualtubular handle having at the rear end valved connections 11 and 12 forthe admission of oxygen and acetylene gas. The front end of the handleis equipped with the usual tubular stem 13 having the usual air valves14 and terminating in an abruptl bent outlet nozzle 15. These parts areof t e usual and well-known type.

In carrying out the invention, I provide a jet block 16 which preferablyis formed of a single block of metal of substantially oblonglongitudinal section and cross section, and of relative great width withrespect to its length as best shown in Figs. 2 and 3, the blockpreferably being perforated transversely along the central plane thereofto provide minute long jet passages 17 corresponding in length to thewidth of the block and which open through the front face 18 and rearface 19 of the block. Adjacent the rear face 19, the block is beveled oneach side, as shown at 20.

Preferably, I provide a manifold for the jet block consisting of a pairof plates 21, as best shown'in Figs. 2 and 4. These plates may be formedof the same metal as the jet block and are relatively th n. The platesare placed against the beveled faces 20 of the jet'block and thusconverge and meet at a point in alinement with the row of jet passagesat a short distance beyond the inner end face 19 of the jet block, asbest shown in Fig. 2. The plates are perforated at the central point oftheir meeting edges to receive the nozzle 15. The meeting edges of theplates are welded together and to the nozzle, as shown at 22. The edgesof the plates which lie along the beveled faces 20 of the jet block arewelded to the jet block, as shown at 23. By welding, I, of course,include brazing, sweating, or any equivalent method of bonding theplates together and to the jet block and nozzle. Preferably, the ends ofthe plates 21 are sealed to ether and sealed to the ends of the jetblock y the use of enough of the welding material to seal the spacesbetween the plates and block, as best shown at 24 in Figs. 1 and 3.

It is now .clear that the plates 21 coact with the rear face 19 of thejet block in forming a manifold transversely and connecting all of thejet passages 17, and that such manifold is substantially triangular inoutline and is of relatively small size so that, in practice, themanifold affords no more than a passage for the combustible fluid, beingof insufficient volumetric capacity to afford any appreciableaccumulation of large volumes of combustible fluid in the manifold.

In Fig. 5, there is shown a modified form of manifold, in which I employa single arched plate 25 of metal, to coact with the rear face 26 of theperforated jet block 27 in forming the manifold, the supply nozzle 28 ofthe burner entering the crown of the plate at a central point, as abovedescribed. In this modified form of the invention, also, the nozzle isbonded to the plate by welding, as shown at 29, and also the edges ofthe plate are bonded to the beveled faces 30 of the jet block bywelding, as shown at 31. The spaces at the ends of the plate are sealedby plugs of welding material 32, as above described.

In both the preferred form of the invention and in the, modified form ofthe invention, it will be seen that the manifold is formed by a separateplate or plates of metal which coact with the rear face of the jet blockadjacent the beveled sides of the block in forming the manifold.Furthermore, it will be observed that the manifold in both instances isno more than a transverse passage for the combustible fluid and is ofrestricted area so as to prevent accumulat on of large volume of thefluid in the manifold.

In practice, as above stated, it has been found that an oXy-aeetyleneburner, constructed as above described, can be used continuously forhours without conduction of heat from the burner block to the manifoldsuflicient to cause back firing. Consequently, the tool may be used inremoving paint and rust and other material from structures such as steelbridges, wood and steel railway coaches and cars, as well as otherstructures which have considerable exposed area.

By referring now to Fig. 3, it will be seen that a substantiallytriangular baflic 33 is disposed in the end of the nozzle 15 in bothforms of the invention, the sides of the baffle, as shown, performingthe function of deflecting the incoming combustible fluid longitudinallytoward the ends of the manifold so that the pressure throughout themanifold will be equalized on the jet passages 1?. Otherwise, withoutthis baflie, the pressure on the jet passages directly in alinement withthe nozzle might be greater than those nearer the ends of the nozzle.

From the above description it is thought that the construction andoperation of my invention will be understood without furtherexplanation.

Having thus described the invention, I claim:

1. An oxy-acetylene burner comprising a tubular handle for supplying acombustible fluid, a jet block of relatively great width with respect toits length having long jet passages corresponding in length to the widthof the block and opening through the front and rear wall of the block,the sides of the block being tapered near the rear wall to provide arear wall of small area, a sheet metal manifold having divergingportions engaging the tapered faces of the jet block and extendingbeyond the rear face of the jet block and coacting with said rear facein connecting all the intake ends of the jet passages of the block, andmeans for connecting said tubular handle to said manifold.

2. An oxy-acetylene burner comprising a solid metal jet block having alongitudinal central row of long jet passages corresponding in length tothe width of the block and opening through the front and rear faces ofthe block, said jet block being of relatively great width with respectto its length and having the sides tapered contiguous to said rear faceof the block to restrict said rear face to a small superficial area, apair of inclined sheet metal plates bonded to the tapered faces of thejet block and being bonded together at their longitudinal meeting edgesbeyond said rear face, said plates coacting with said rear face informing a manifold of substantially triangular cross section connectingall of said jet passages and of small diameter to prevent accumulationof large volume of the combustible fluid in the manifold, and a hollowhandle carried by said manifold for supplying a combustible fluid tosaid manifold.

3. An oXy-acetylene burner comprising a jet block of relatively greatWidth with respect to its length having a longitudinal row of long jetpassages corresponding in length to the width of the jet block andopening through the front and rear faces of the block, the sides of theblock being tapered contiguous to the rear face thereof to provide arear face of relatively small area, an arched sheet metal manifold ofdifferent metal than the jet block having the sides thereof disposedobliquely and bonded to said beveled faces of the jet block and havingthe crown thereof extending over said rear face of the jet block inclose proximity thereto and forming a manifold of relatively smalldiameter connecting all of said jet passages, and a tubular handle for acombustible fluid passing through an opening in the crown of said archedmanifold.

In testimony whereof I afiix my si ature.

BRYAN M. MILLER. 5.]

